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Full text of "The manufacture and properties of iron and steel"

222                          METALLUHGY OF IKON AND STEEL.
Calorlea. Heat produced by oxidation of 10 kg. of silicon......    64,140
Heat produced by union of 21.4 kg. SlOs with FeO..      8,317
67,457 Absorption by reduction of Iron oxides.............    46,311
Net heat produced...........................    21,144
Oxidation of carbon:
Making the same assumptions as in the calculation of silicon, we have the following: 3.75 per cent, of 1000 kilos=37.5 kilos carbon, requiring 50.0 kilos oxygen. 50.0 kilos oxygen require 166.7 kilos Pe203. 166.7 kilos,Fe203 contain 116.7 kilos Fe, and the heat absorbed in dissociating 166.7 kilos Fe203 will be the same as the heat created in burning 116.7 kilos Fe to Fe203, which is
116.7X1~46=203,758 calories.
The heat produced will be the amount created by the burning of 37.5 kilos carbon to carbonic oxide (CO), which is 37.5X2450= 91,875. The net result, therefore, of the oxidation of the carbon by ferric oxide is as follows:
CalorlęB.
Heat absorbed......................................  203,758
Heat created.......................................,    91,875
Net heat absorbed.................................    111,883
Silicon and carbon together:
The combined effect of the oxidation of the silicon and carbon has been shown to be as follows:
Calories.
Heat absorbed In burning carbon........................111,883
Heat created In burning silicon........................    21,144
Net heat absorption...............................      90,739
Two other factors must be taken into consideration. When one kilogram of carbon unites with metallic iron the combination produces 705 calories and the union of 1 kg. of silicon with iron produces 931 calories.* Conversely, when by the reaction of ore upon the bath the carbon is taken away from the iron, there must
* E. D. Campbell; Journal J. and S. I, May, 1901.